I interviewed at 2 schools and wanted to attend one more than the other. The one I wasn't as interested in attending I interviewed first at and got accepted. My next interview for my top school was a few months later. I payed the nonrefundable deposit to hold my seat. I got accepted by the school I wanted to attend and withdrew my acceptance from the first school. No problem at all. Most schools have a $500 or $1000 deposit, but once you go to pay for school, worrying about a small deposit like that is a drop in the bucket. Congrats on your interviews and good luck!